Initial commit

Scenes/Scripts/earth_imposter.gd

@@ -0,0 +1,68 @@
+extends Node3D
+## Earth impostor — from Luna you are always far; show a disc inside far plane.
+
+@export var real_earth_path: NodePath = ^".."
+@export var surface_path: NodePath = ^"../EarthSurface"
+@export var impostor_mesh_path: NodePath = ^"ImposterSphere"
+
+@export var switch_distance: float = 150000.0
+@export var visual_distance: float = 120000.0
+@export var real_radius: float = 637100.0
+
+var _real: Node3D
+var _surface: Node3D
+var _mesh: MeshInstance3D
+var _base_radius: float = 0.5
+
+func _ready() -> void:
+	_real = get_node_or_null(real_earth_path) as Node3D
+	_surface = get_node_or_null(surface_path) as Node3D
+	_mesh = get_node_or_null(impostor_mesh_path) as MeshInstance3D
+
+	if _mesh and _mesh.mesh is SphereMesh:
+		_base_radius = maxf((_mesh.mesh as SphereMesh).radius, 0.5)
+
+	if _mesh:
+		_mesh.visible = false
+		# Keep YOUR material/texture; only force unshaded so it reads in space
+		var src_mat: Material = _mesh.get_active_material(0)
+		if src_mat is StandardMaterial3D:
+			var mat: StandardMaterial3D = (src_mat as StandardMaterial3D).duplicate()
+			mat.shading_mode = BaseMaterial3D.SHADING_MODE_UNSHADED
+			_mesh.material_override = mat
+
+	print("EarthImposter ready | real=", _real, " surface=", _surface, " mesh=", _mesh)
+	set_process(true)
+
+func _process(_delta: float) -> void:
+	if _real == null or _mesh == null:
+		return
+
+	var viewer: Node3D = FloatingOrigin.focus
+	if viewer == null or not is_instance_valid(viewer):
+		_mesh.visible = false
+		return
+
+	var to_body: Vector3 = _real.global_position - viewer.global_position
+	var dist: float = to_body.length()
+	if dist < 1.0:
+		_mesh.visible = false
+		return
+
+	# Close approach only: real surface
+	if dist < switch_distance:
+		_mesh.visible = false
+		if _surface:
+			_surface.visible = true
+		return
+
+	# Far (normal from Luna): impostor on
+	# Leave EarthSurface visible until you confirm the disc — then you can hide it
+	var dir: Vector3 = to_body / dist
+	_mesh.global_position = viewer.global_position + dir * visual_distance
+
+	var visual_radius: float = real_radius * (visual_distance / dist)
+	visual_radius = clampf(visual_radius, 8000.0, 150000.0)
+	_mesh.scale = Vector3.ONE * (visual_radius / _base_radius)
+	_mesh.visible = true
+